Manual Bosch psb 850 2 ra (page 10 of 60) (English, German, Dutch, Danish, French, Italian, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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Overload Clutch (SafeStop)

In order to limit dangerous reaction torque, the

machine is equipped with a safety clutch

(SafeStop).

Nonetheless, high reaction torque can occur

when the tool insert suddenly jams. Always hold

the machine tightly with both hands and en-

sure secure footing.

When the clutch disengages, the drilling spindle

comes to a stop and the ratchet sound of the

clutch disengaging is heard. Switch off the ma-

chine immediately when the clutch disengages.

In the first gear, the clutch disengages at ap-

prox. 33 Nm; in second gear at approx. 13 Nm.

Speed Preselection (PSB 850-2 RE)

(see figure )

The required speed can be pre-selected with

thumbwheel 15 (also while running).

Speed Preselection (PSB 1000-2 RE)

The required speed can be pre-selected with the

power control thumbwheel 3 (also with the ma-

chine running).

Gear Selection, Mechanical

Two speed ranges can be pre-selected with the

gear selector 8:

Speed I: Lower rpm range

Speed II: Higher rpm range

The gears can be switched when the machine is

running or at standstill. However, this should not

be carried out at full load or maximum speed.

Reversing the Rotational Direction

Operate the rotational direction switch 7 only

at a standstill.

Using the rotational direction switch 7, the direc-

tion of rotation of the machine can be changed

(by actuating the On/Off switch 6, the rotational

direction switch 7 can be locked).

Right Rotation (see figure )

Press the rotational direction switch through to

the right stop (for drilling, impact drilling, driving

screws, etc.).

Left Rotation (see figure )

Press the rotational direction switch through to

the left stop (for loosening and unscrewing

screws and nuts).

Drilling and Impact Drilling

Drilling and Screwdriving

Set the selector switch 2 to the “Drilling

and Screwdriving” symbol.

Impact Drilling

Set the selector switch 2 to the “Impact

Drilling” symbol.

The selector switch 2 engages noticeably and

can be actuated with the machine running.

Electronic Torque Limitation/

Speed Preselection

(Power Control PSB 1200-2 RPE)

Drilling with speed preselection

Set the selector switch 4 to the “Drill-

ing” symbol. The required speed can

be pre-selected with the thumb-

wheel 3 (also during running).

Screwdriving with torque limitation

Set the selector switch 4 to the

“Screwdriving” symbol. The effective

torque at the drill spindle can be var-

iably adjusted (0.5 – 10 Nm) with the

thumbwheel 3:

I = low torque

III = high torque

The maximum speed is automatically adapted to

the adjusted torque.

If the pre-selected torque is reached during

screwdriving, the machine switches off and

stops. If the load on the machine is then removed

with the On/Off switch 6 still pressed, the contin-

ued run is at very low speed for safety reasons.

Briefly releasing the On/Off switch 6 automati-

cally restores the previous operating condition,

so that the next screw will be driven in with the

same torque.

The chuck may be changed only in the first

gear.

Clamp the short end of an Allen key in the chuck.

For models with a keyless chuck, an open-end

spanner (size 19) can also be applied to the front

of the chuck for easier manipulation.

Replacing the Drill Chuck

10 • 2 609 932 245 • 02.07

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Bosch psb 850 2 ra Manual

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